放射線量および放射能濃度算出に用いる計算条件について

概要

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Several conditions are usually assumed to calculate radiation dose and the sum of the ratios of radioactivity concentrations in air and water to the maximum permissible concentrations regulated in law. One of them is an assumption to use the regulated maximum radioactivities every day. Each value calculated under this assumption is mostly larger than the actual value. This means that the assumption is the safer condition of calculation from the viewpoint of radiation protection. The safety factors were examined at the nuclear medical laboratory in the University Hospital of Tsukuba. It was found that the calculated values under this assumption were more than three times larger than the actual values of the radiation doses for a week and for three months. Concerning the sum of the ratio of radioactivity concentrations in air or water, calculated values were at least five times larger than the actual average values for a week and ten times larger for the average values for three months. Whereas, the sum of the ratios on the average for eight hours were almost equal to that when the regulated maximum radioactivity of 131I was used in a day.